Portable air clearing fan



Och 1943- J. L. BRANDENBURG PORTABLE AIR CLEARING FAN Filed June 21, 1945 INVENTOR JOSEPH L. BRANDENBURG ATTORN EY Patented Oct. 12, 1948 UNITED STATESHPATENT OFFICE 1 Claim.

This invention relates to apparatus useful in regulating air flow. While not limited thereto, it

value in clearing the air in the rooms of living quarters. metropolitan kitchens where excess heat, smoke, and odors exist requirin thorough ventilation of the rooms.

The device is simple in operation comprising merely one switch for its control, yet may easily be used for a variety of purposes and permits ready reversion of air flow on the window sill, either exhausting used up inside air or drawing fresh outside air forcefully into the room.

In spite of its many advantages, the device is small in size, relatively light weight, easily fitting and may readily be used on a variety of window sills where many rooms are in need of alternate airing.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claim in which the various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure:

Fig. 1 is a perspective frontal view of the improved air clearing unit.

Fig. 2 is an end elevational view of the device.

Fig. 3 is a perspective view taken from the side opposite from the side from where Fig. 1 has been viewed showing the device in use during air intake operation.

Fig. 4 is a perspective detail showing the main or intake screen apart from the entire device.

Fig. 5 is a perspective view of the motor support also removed and apart from the main device.

In the device made in accordance with the instant invention, a rectangularly cross sectional frame ID, is provided having a portion ll of the bottom wall slanting upwardly and rearwardly so as to extend over a portion of a window stool 26 and has at its front and back openings, two open screens [2 and [3, respectively, keeping large and damaging objects from the interior of the frame Ill, yet freely admitting air.

In a preferred form of the invention back screen [3 is bordered on its lower side by the above mentioned slanting portion 1 i, and on its upper extremity by another upper slanting portion I4 in turn bordering the top wall of frame H) which may conveniently be provided with a carrying handle It is of special benefit when used in [5 for use where transportability of the device is desired. A flat bottom wall located between the lower slanting portion H and frontal screen 12 completes the outer frame H3 and provides full enclosure of the inside structure with the exception of the screened intakes i2 and I3. It is very convenient to make the screens i2 and i3 readily removable by holding them normally in fixed position by means of holes IS in the outer frame structure into which fit supporting screws 30 attached to said screens [2 and I3. Inside the enclosed frame ill a U-shaped symmetrically located support is centrally resting upon the flat bottom wall of frame H! tightly fits a compact electric motor [9 which may be of the Robbins- Myer type and should provide high R. P. M. The motor l9 should be securely held by means of another set of screws I! and corresponding holes It in the U-shaped support [8. It supports in turn an inductor type fan 2!] having propeller shaped blades located near the front intake screen l2. The electric motor I9 is connected to a convenient power source by means of cord 2l' piercing one wall of the frame through gasket 22 preventing loss of driven air through that point. An off and on switch 23, located near the top of the outside frame I0 conveniently on one of the side walls, is also connected to the motor [9 by means of an electric cord 2|.

In actual operation the power driven fan 26 operates near a large air intake !2 grasping air and pushing it around motor it which it thereby air-cools toward the funnel-shaped back structure of the enclosed frame H3 formed by the two converging slanting portions ii and M which direct and concentrate the air blasts toward back screen l3. It will be readily understood that a conventional air filter may easily be inserted near screen l2 or screen it so as to increase the purity of the air where desired.

In one preferred mode of operation illustrated in Fig. 1, the air-clearing device is placed in front of a window 2% fitting with its flat bottom member upon window sill 25 with its lower slanting portion H extending over the window stool 26 and having its open back screen l3 touch the window sash 27 and closing a window opening between the sash 2i and the stool it. It is of course well understood that the air cleaning unit is built compactly enough so as not to occupy the entire window sill 25 leaving considerable space for objects placed thereon and for ready grasping and handling.

In the above position the unit is ready to grasp inside air through frontal screen I2 and to forcefully eject this stale air through the window opening into the outside atmosphere.

On the other hand, the device may readily be reversed as shown in Fig. 3 forcefully taking in the air from the outside atmosphere through screen l3 and forcefully ejecting said air into the room confronting frontal screen I2. 7

A compact, adaptable and portable, easily oper able air clearing unit can thus be made in accordance with the invention permitting ready and forceful direction of air flow as desired.

While I have illustrated and described the pre-v ferred embodiments of my invention, it is to be understood that I do not limit myself to the Precise constructions herein disclosed and the right is reserved to all changes and modificatidnscoming within the scope of the invention as defined in the appended claim.

Having thus described my invention, what I claim as new, an d desireto secure by United States Letters Patent isz r man an clearing fan having a casing rectangularin'ci'oss-section and formed with open ends closed by screens and a motor driven fan disposed centrally within said casing for drawing airint'o the'casin through one screen and ex haustingthe air through the other screen, said casing having its rear portion tapered to'extend over the outer portion of a window stool when said casing is rested on a Window sill, means securely supporting themotorof the motor driven ran in the casing with the least resistance to the movement of air through the casing by the support, comprising a U sh'aped frame having its intermediate arm securelyattached to the bottom wall of the casing, said frame having its side arms extended vertically and spaced a distance equal to the width of the motor to extend along diametrically opposite sides of the motor, said side 7 arms having their top ends formed with lines of openings, and screws passing through said openings and threadedly engagin complementary threaded openings in the sides of the motor securely mounting the motor, on the top ends of said side arms, said side arms being relatively thin and having their widths extended parallel to the V path of travel of the air through the casing.

JOSEPH L. BRANDENBURG.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS t 7 Essick. f--- July 31, 1945 

